-2a+4=20

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Solution for -2a+4=20 equation: 


a in (-oo:+oo)

4-2*a = 20 // - 20

4-2*a-20 = 0

-2*a-16 = 0 // + 16

-2*a = 16 // : -2

a = 16/(-2)

a = -8

a = -8

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